fix: use a proper endpoint for DirectPath tests (#2186)

* fix: use a proper endpoint for DirectPath tests

Author: ko3a4ok

google-cloud-spanner/src/test/java/com/google/cloud/spanner/GceTestEnvConfig.java

@@ -53,7 +53,7 @@ public class GceTestEnvConfig implements TestEnvConfig {
   public static final String DP_IPV6_PREFIX = "2001:4860:8040";
   public static final String DP_IPV4_PREFIX = "34.126";
 
-  private static final String DIRECT_PATH_ENDPOINT = "aa423245250f2bbf.sandbox.googleapis.com:443";
+  private static final String DIRECT_PATH_ENDPOINT = "wrenchworks-nonprod.googleapis.com:443";
 
   private final SpannerOptions options;